Pronunciation guide: IPA symbols, stress and word endings

θ	thin	ð	this	ʃ	she	ʒ	measure
tʃ	church	dʒ	judge	ŋ	sing	j	yes

p b t d k g f v s z h m n l r w sound as in ordinary English spelling.

ˈ main stress, before the stressed syllable: /ˈwɔːtə/ water · ˌ lighter (secondary) stress: /ˌʌndəˈstænd/ understand
ː a long vowel · (r) an r said only in accents that pronounce it (most American, Scottish, Irish)

-s / -es (plurals; he/she form of verbs): /s/ after voiceless sounds (cats), /z/ after voiced (dogs), /ɪz/ after s, z, sh, ch, j sounds (buses, watches). Spelling: -es after s, x, z, ch, sh; consonant + y → -ies (city → cities).
-ed (past): /t/ after voiceless sounds (walked), /d/ after voiced (played), /ɪd/ after t or d (wanted). Spelling: love → loved, stop → stopped, carry → carried.
-ing: make → making, run → running, see → seeing.
Irregular: go, went, gone · be, was, been · see, saw, seen · man → men · child → children · mouse → mice.
Older (King James) forms: -eth = -s (he loveth = he loves) · -est with “thou” (thou lovest) · spake = spoke.

counteract

/ˈkaʊntəɹˌækt/ noun, verb

Forms counteracts counteracting counteracted

noun An action performed in opposition to another action.
verb (transitive) To have a contrary or opposing effect or force on someone or something.
verb (transitive) To deliberately act in opposition to, to thwart or frustrate.

Synonyms

verb To act in opposition to; to hinder, defeat, or frustrate, by contrary agency or influence; as, to counteract the effect of medicines; to counteract good advice.

Sources: Wiktionary · WordNet 3.0 · Webster’s 1913 — from the Wiktionary entry “counteract”, CC BY-SA 4.0. Details

Sanskrit dictionary entries whose meaning includes “counteract” (best matches first).

विप्रतिकृ vi-prati-kṛ -karoti, etc., to counteract, oppose.
प्रतिविधि prati-vidhi a means of counteracting, an act or ordinance designed to counterwork or counteract, remedy; retaliation.
प्रतिविधा prati-vi-dhā -dadhāti, -dhatte, -dhātum, to place or dispose in order, arrange, prepare, make ready, fit out, equip; to d…
प्रत्याख्या praty-ā-khyā -khyāti, -khyātum, to proclaim one by one (Vedic); to decline, refuse, reject, disallow; to deny; to interdi…
प्रतिकृ prati-kṛ -karoti, -kurute, -kartum, to do or make (anything as a defence) against (Vedic); to return, repay, recompen…
भूतोदन bhūtodana a dish of rice (eaten to counteract the influence of demons).
पित्तारि pittāri ‘enemy of bile,’ i.e. anything antibilious; name of various plants and vegetable substances used to countera…