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.

back up

verb

Forms backs up backing up backed up

verb (idiomatic, intransitive) To move backwards, especially for a vehicle to do so. “That beeping sound indicates that the truck is backing up.”
verb (idiomatic, transitive) To move a vehicle backwards. “Back up the car a little, you're blocking the driveway.”
verb (idiomatic, intransitive) To undo one's actions. “I couldn't see how to finish the project, so I backed up and tried it another way.”
verb (idiomatic, intransitive) To reconsider one's thoughts. “This isn't working. Let's back up and think about it.”
verb (idiomatic, computing, transitive) To copy (data) so that it can be restored if the main copy is lost. “Back up your documents folder before applying the update.”
verb (idiomatic, transitive) To provide support or the promise of support to. “You should be careful. This guy is backed up by the local gang.”
verb (idiomatic, intransitive, cricket) For the non-striker to take a few steps down the pitch, in preparation to taking a run, just as the bowler bowls the ball.
verb (idiomatic, intransitive, cricket) For a fielder to position himself behind the wicket (relative to a team-mate who is throwing the ball at the wicket) so as to stop the ball, and prevent overthrows.

Synonyms

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