A small blood-feeding arachnid that attaches to skin.

• Found in grass and woodland; some species transmit disease.

A small mark (✓) indicating selection, correctness, or completion.

• Common in lists, forms, and voting.

A short, light clicking sound, especially from a clock.

• One counted movement of a clock’s mechanism.

To make a regular clicking sound, as a clock does.

To mark with a tick/check; to check off an item.

To function or operate, especially mechanically.

• Figurative: to have motivating inner workings.

A very short moment; an instant.

• Chiefly informal, often in the phrase in a tick.