Synonyms of fight back in English:

fight back

See US English definition of fight back

See UK English definition of fight back

See Spanish definition of contener


1‘use your pent-up anger to fight back’

retaliate, counterattack, strike back, hit back, reply, respond, react, reciprocate, return fire, give tit for tat, give as good as one gets, return the compliment, defend oneself, put up a fight, return like for like, get back at someone, give someone a dose of their own medicine, give someone a taste of their own medicine
formal requite something
archaic serve someone out, give someone a Roland for an Oliver

turn the other cheek

2‘she had to fight back tears of frustration’

repress, restrain, suppress, stifle, smother, hold back, keep back, keep in check, check, curb, contain, control, keep under control, rein in, silence, muffle, bottle up, choke back, swallow, strangle, gag
informal button up, keep the lid on, cork up

give in to, let out