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|I/you/we/they||sit in on|
|he/she/it||sits in on|
|present participle||sitting in on|
|past tense||sat in on|
|past participle||sat in on|
This is the British English definition of sit in on. View American English definition of sit in on.
the period of 40 days before Easter, starting on Ash Wednesday, when some Christians stop eating...