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.

obstruct

/əbˈstɹʌkt/ verb

Forms obstructs obstructing obstructed

verb To block or fill (a passage) with obstacles or an obstacle.
verb To impede, retard, or interfere with; hinder. “They obstructed my progress.”
verb To get in the way of so as to hide from sight.

Synonyms

From Latin past participle stem obstruct- (“blocked up”), from verb obstruere, from ob (“against”) + struere (“pile up, build”).

verb To block up; to stop up or close, as a way or passage; to place an obstacle in, or fill with obstacles or impediments that prevent or hinder passing; as, to obstruct a street; to obstruct the channels of the body.
verb To be, or come, in the way of; to hinder from passing; to stop; to impede; to retard; as, the bar in the harbor obstructs the passage of ships; clouds obstruct the light of the sun; unwise rules obstruct legislation. "Th' impatience of obstructed love." Johnson.

Etymology [L. obstructus, p.p. of obstruere to build up before or against, to obstruct; ob (see Ob-) + struere to pile up. See Structure.]

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

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

विघ्नय vighnaya vighnayati, -yitum, to impede, check, obstruct.
समारुध् sam-ā-rudh -ruṇaddhi, -runddhe, -roddhum, to block up, obstruct, stop up.
द्वृ dvṛ dvarati, etc., to obstruct; to cover; to disregard; to appropriate.
परिपन्थय pari-panthaya -panthayati, -yitum, to obstruct the way, oppose, resist (with acc.).
रुरुत्सु rurutsu wishing to obstruct or oppose; wishing to bind or tie up (as the hair).
मिछ् mich micchati, mimiccha, micchitum, to annoy, hurt, pain; to obstruct, hinder.
नितॄ ni-tṝ -tirati, -taritum, -tarītum, Vedic to dispel, subdue, overpower, obstruct.
आरुध् ā-rudh -ruṇaddhi, -roddhum, to keep off: Caus. -rodhayati, -yitum, to obstruct, impede.