jigger

1. a machine or vehicle with a part that rocks or moves to and fro, e.g. a jigsaw.

   they invented a jigger that pulls nets under the ice

2. a person who dances a jig.
3. a small sail set at the stern of a ship.
4. a measure or small glass of spirits or wine.

   a jigger or two of rum

5. a rest for a billiard cue.
6. a metal golf club with a narrow face.
7. a small hand- or power-operated railway vehicle used by railway workers.

1. rearrange or tamper with.

   conventional price indexes often jigger the market basket's content

mid 16th century (originally a slang word for a door): from the verb jig.

noun

variant spelling of chigger.

1. a tropical flea, the female of which burrows and lays eggs beneath the host's skin, causing painful sores.
2. a harvest mite.

mid 18th century: variant of chigoe.