to participate / to take part / to join

to raise / to increase

gas station

to intensify

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

to exert (effort or pressure)

(of cargo etc) to load

Singapore

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

to reinforce / to strengthen / to increase

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

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

more (than sth else) / even more

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 encrypt / encryption / to protect with a password

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

to accelerate / to speed up

to add / to increase

Canada / Canadian

to process / processing / working (of machinery)

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

to speed up / to expedite

to heat

to work extra hours / to do overtime

Tagalog (language)

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 superimpose / to layer / to overlay / to superpose

to work overtime

to make text bold

extra credit (on a test) / bonus point

to deepen

California

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

additive / food additive

Senegal

Calcutta (India)

to reinforce (a structure) / to strengthen

Chicago, USA

additional / annex

to lengthen

Bengal / Bangladesh

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

in addition / extra

to raise salary

Bulgaria

Bangladesh (formerly East Pakistan)

to intensify / to speed up / to step up

moreover / in addition to that

Caribbean

to increase a price

(sports) overtime / extra time / play-off

to double / to redouble

to add up (numbers) / (fig.) to put together (several things of the same type, e.g. skills)

Las Vegas, Nevada

California

Alaska, US state

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

plus sign + (math.)

weighted average

Stuttgart city in southwest Germany and capital of Baden-Württemberg 巴登·符騰堡州｜巴登·符腾堡州

to pressurize / to pile on pressure

to expedite / (of a delivery etc) expedited / express / urgent

Madagascar

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

Ghana

without / not / un-

to add material to an exam / supplementary exam

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

Catalonia

Jamaica

value added (accountancy)

Costa Rica

to increase a bet / to raise (poker) / to raise the stakes

to aerate / to ventilate

extra bus or train

added-value (accountancy)

Dominica / Dominican Republic

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)

widen

to add to / supplementary

Tonga, South Pacific archipelago kingdom

California

processing plant

acceleration

Jakarta, capital of Indonesia

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

to top up / to fill to the brim

(vaccine) booster shot

lit. contribute bricks and tiles for a building (idiom) / fig. to do one's bit to help

Garcia (person name)

addition

Katō (Japanese surname)

Garfield (comic strip cat created by Jim Davis)

Canada

Gabon

to crown / coronation

addition, subtraction, multiplication and division: the four basic operations of arithmetic

Nicaragua