Whistle is pronounced WIS-əl (IPA /ˈwɪsəl/). Silent 't' — it sounds like 'wis-ul' with two soft beats.
IPA: /ˈwɪsəl/
Syllables: WIS · əl
Common ESL mistake: Learners pronounce the 't' saying 'wis-tul' with a /t/.
Tip: Silent 't' — it sounds like 'wis-ul' with two soft beats.