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.

mainstream

UK /ˈmeɪn.stɹiːm/ · US /ˈmeɪn.stɹim/ adjective, noun, verb

Forms mainstreams mainstreaming mainstreamed

adjective Used or accepted broadly rather than by small portions of population, market, scientific community, etc. “They often carry stories you won't find in the mainstream media.”
noun The principal current in a flow, such as a river or flow of air
noun (usually with the) That which is common; the norm. “ideas outside of the mainstream”
verb (transitive) To popularize, to normalize, to render mainstream.
verb (intransitive) To become mainstream.
verb (transitive, education, chiefly US) To educate (a disabled student) together with non-disabled students.

Synonyms

From main + stream. Cognate with Icelandic meginstraumur (“a main current, mainstream”).

Sources: Wiktionary — from the Wiktionary entry “mainstream”, CC BY-SA 4.0. Details