1. (verb)trip, actuate, trigger, activate, set off, spark off, spark, trigger off, touch off put in motion or move to act "trigger a reaction"; "actuate the circuits"
2. (verb)depart, part, start, start out, set forth, set off, set out, take off leave "The family took off for Florida"
3. (verb)bring out, set off direct attention to, as if by means of contrast "This dress accentuates your nice figure!"; "I set off these words by brackets"
4. (verb)explode, detonate, blow up, set off cause to burst with a violent release of energy "We exploded the nuclear bomb"
5. (verb)cancel, offset, set off make up for "His skills offset his opponent's superior strength"
6. (verb)set off set in motion or cause to begin "The guide set the tour off to a good start"
7. (verb)incite, instigate, set off, stir up provoke or stir up "incite a riot"; "set off great unrest among the people"
Definitions of set off 
Afrikaans: begin, vertrek
Arabic: يَبْدأ الرِّحْلَه
Bulgarian: отправям се
Brazilian: pôr-se a caminho
Czech: vydat se na
German: aufbrechen
Danish: tage afsted
Greek: ξεκινώ για ταξίδι
Spanish: partir, salir, ponerse en
Estonian: minema hakkama
Farsi: عازم سفر شدن
Finnish: lähteä matkaan
French: se mettre en route (pour)
Hebrew: לָצֵאת לַדֶרֶך
Hindi: सफर शुरू करना
Croatian: krenuti
Hungarian: útnak indul
Indonesian: berangkat
Icelandic: leggja af stað
Italian: partire, mettersi in viag
Japanese: 出発する
Korean: (여행 등을) 시작하다
Lithuanian: išsiruošti
Latvian: doties
Malay: bersiap sedia
Dutch: vertrekken
Norwegian: ta ut, dra av gårde
Polish: wyruszać
Persian: عازم سفر شدن
Pashto: سفر ته تلل
Portuguese: pôr-se a caminho
Romanian: a porni (spre)
Russian: отправляться (в дорогу)
Slovak: vydať sa na
Slovenian: kreniti
Serbian: krenuti
Swedish: ge sig i väg
Thai: ออกเดินทาง
Turkish: yolaçıkmak
Taiwanese: 出發
Ukrainian: вирушати
Urdu: سفر کی شروعات کرنا
Vietnamese: khởi hành
Chinese: 出发，动身
