Check-off clause

check-off list

compartment check-off list

Compulsory check-off clause

method of check-off

Voluntarily check-off clause

check digit check

Check in and check out

check sum check

machine check and program check

allowable shut-off time of fast shut-off valve

fall off [= bear off]

hang off [= stop off]

Off beat takes off

Off-Line Handwritten Chinese Character Recognition (off-line HCCR)

off-line trusted third party (off-STTP)

Off-on-off

one-off write-off

voltage cut off or current cut off