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

to add hail to snow (idiom); one disaster on top of another / to make things worse in a bad situation

to exert (effort or pressure)

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

(of cargo etc) to load

to encrypt / encryption / to protect with a password

to speed up / to expedite

to reinforce / to strengthen / to increase

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

to add / to increase

Canada / Canadian

Singapore

to process / processing / working (of machinery)

more (than sth else) / even more

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

to accelerate / to speed up

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

to deepen

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

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

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

superposition / layering / overlay

Chicago, USA

additional / annex

to heat

to work extra hours / to do overtime

in addition / extra

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)

California

moreover / in addition to that

to double / to redouble

Jamaica

to work overtime

Ghana

additive / food additive

(sports) overtime / extra time / play-off

Las Vegas, Nevada

to reinforce (a structure) / to strengthen

to become more urgent / more rapid / urgent / to handle a matter urgently

added-value (accountancy)

to lengthen

Bengal / Bangladesh

Bulgaria

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

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

Caribbean

California

Bangladesh (formerly East Pakistan)

Bugatti (name) / Bugatti Automobiles S.A.S. (French car company)

to make text bold

acceleration

fuel nozzle

addition

to increase price

Garfield (comic strip cat created by Jim Davis)

processing plant

Catalonia

to crown / coronation

to top up / to fill to the brim

Galicia, province and former kingdom of northwest Spain

without / not / un-

four rules of arithmetic / addition, subtraction, multiplication and division

to raise salary

Costa Rica

plus sign + (math.)

to pressurize / to pile on pressure

Dominican Republic

gallon (loanword)

California

Alaska, US state

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

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

Dominica / Dominican Republic

Madagascar

Caucasus / Caucasian

weighted average

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

Málaga, Spain / Malaga city in Iranian East Azerbaijan

value added (accountancy)

Lake Baikal

Nicaragua

Tonga, South Pacific archipelago kingdom

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 intensify / to speed up / to step up

to aerate / to ventilate

Picasso

Jakarta, capital of Indonesia

(sports) overtime / extra time / play-off

Gatling (name) / Richard J. Gatling (1818-1903), inventor of the Gatling gun

widen

to add material to an exam / supplementary exam

Senegal

Tagalog (language)

sternly / strictly / harshly / stringently / rigorously

all the more / even more / further