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.

“backtracked” is a form of

backtrack

/ˈbæk.tɹæk/ noun, verb

Forms backtracks backtracking backtracked

noun The act of backtracking.
verb To retrace one's steps. “I dropped my sunglasses and had to backtrack to find them.”
verb To repeat or review work already done. “If we backtrack through this problem, maybe we can figure out where we went wrong.”
verb (aviation) To taxi down an active runway in the opposite direction to that being used for takeoff. “Speedbird One: enter and backtrack Runway 27 Left.”
verb To exercise a racehorse around the racetrack in the opposite direction to that in which races are run.
verb To go back on or withdraw a statement. “After enormous public outrage, the government backtracked on its proposed ban.”

Synonyms

From back + track.

Sources: Wiktionary · WordNet 3.0 — from the Wiktionary entry “backtrack”, CC BY-SA 4.0. Details