thick and thin

come thick and fast

To arrive rapidly in large groups.

have a thin time of it

To be in a difficult or precarious situation due to one not having enough money.

lay it on thick

To exaggerate or overstate a feeling or emotion.

on thin ice

Dangerously, hazardously, delicately.

out of thin air

From nowhere or nothing; from a non-existent or unknown source.

skate on thin ice

To be (or to place oneself) in a risky, potentially dangerous or delicate situation.

spread oneself thin

To commit oneself to too many projects, so that there is little chance of completing them all satisfactorily.

thick and threefold

In quick succession, or in great numbers.