Definition of on tickBritish, old-fashioned
- She bought her supplies on tick.
: a light rhythmic audible tap or beat
: the time taken by the tick of a clock : moment
: a small spot or mark
: to make the sound of a tick or a series of ticks
: to operate as a functioning mechanism : run
: to mark with a written tick : check
: any of a superfamily (Ixodoidea) of bloodsucking acarid arachnids that are larger than the related mites, attach themselves to warm-blooded vertebrates to feed, and include important vectors of infectious diseases
: any of various usually wingless parasitic dipteran flies — compare sheep ked
: the fabric case of a mattress, pillow, or bolster
: credit, trust
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