to participate / to take part / to join

to raise / to increase

gas station

to intensify / to sharpen / to accelerate / to aggravate / to exacerbate / to embitter

(idiom) to make matters even worse / to add insult to injury

to exert (effort or pressure)

cryptocurrency

Singapore

abbr. for Canada 加拿大 / surname Jia

to add / plus / (used after an adverb such as 不, 大, 稍 etc, and before a disyllabic verb, to indicate that the action of the verb is applied to sth or sb previously mentioned) / to apply (restrictions etc) to (sb) / to give (support, consideration etc) to (sth)

to become a member / to join / to mix into / to participate in / to add in

more (than sth else) / even more

to encrypt / encryption / to protect with a password

plus / to put in / to add / to add on / to add into / in addition / on top of that

to ratchet up / to raise (expectations etc) / to increase (a quota, a position in the market etc) / to up the ante / (computing) to encode

to reinforce / to strengthen / to increase

Canada / Canadian

Catalonia

to add oil / to top up with gas / to refuel / to accelerate / to step on the gas / (fig.) to make an extra effort / to cheer sb on

(of cargo etc) to load

to add / to increase

to accelerate / to speed up

to become a member of an alliance or union / to align / to join / participate

to process / processing / working (of machinery)

to increase (e.g. one's effort)

to increase price

to speed up / to expedite

Chicago, USA

additional / annex

California

to work overtime

to double / to redouble

in addition / moreover / (used before a disyllabic verb to indicate that the action of the verb is applied to sth or sb previously mentioned) / to apply (restrictions etc) to (sb) / to give (support, consideration etc) to (sth)

to recharge (money onto a card) (Tw)

sum (result of addition) / addition / total / to add up a number of items / to accumulate

extremely (placed after verb or adjective)

to work extra hours / to do overtime

Jamaica

to heat

participant

Alaska, US state

to intensify / to speed up / to step up

surcharge

to add to / supplementary

to deepen

Inca (South American Indians)

to add something extra / an additional increment / addendum / to append / an additional posthumous title

in addition / extra

Bulgaria

Tonga, South Pacific archipelago kingdom

to raise salary

Kaliningrad, town on Baltic now in Russian republic / formerly Königsberg, capital of East Prussia

sternly / strictly / harshly / stringently / rigorously

to impose / to force upon

US and Canada (abbr.)

lit. change to more severe (idiom); to become more intense (esp. of shortcoming) / to aggravate / to intensify

Bengal / Bangladesh

to reinforce (a structure) / to strengthen

Jakarta, capital of Indonesia

Canada

Garcia (person name)

eucalyptus (loanword)

in the extreme (idiom) / incapable of further increase

(math.) to weight / weighting / weighted (average, index etc)

to lengthen

(botany) coca (loanword)

accelerator (computing) / particle accelerator

Gospel according to St Luke

Las Vegas, Nevada

Singaporean person / Singaporean

to make text bold

additive / food additive

extra credit (on a test) / bonus point

to pressurize / to pile on pressure

University of California / abbr. for 加利福尼亞大學｜加利福尼亚大学

to seal (with official stamp) / to stamp / fig. to ratify / to put lid on (cooking pot) / to cap / to build an extension or additional storey

Acanthopanax gracilistylus

all the more / even more / further

to make heavier / to emphasize / (of an illness etc) to become more serious / to aggravate (a bad situation) / to increase (a burden, punishment etc)

vodka (loanword)

Dominica / Dominican Republic (Tw)

Madagascar

Epistle of St Paul to the Galatians

value added (accountancy)

gallon (loanword)

California

augment / add

additional element / (computing) add-on / plug-in

manyprickle (Acanthopanax senticosus), root used in TCM

(in former times) coming-of-age ceremony at 20 years

Nicaragua

Lake Baikal

Calcutta (India)

to heat / to add warmth / to raise temperature / fig. to stimulate

Málaga, Spain / Malaga city in Iranian East Azerbaijan

without / not / un-

sweeten

lit. to add oil and vinegar / fig. adding details while telling a story (to make it more interesting)

Alaska, US state

humidifier