A prison cell.
The penis.
A safe.
Chiefly followed by out: originally (mining), of a vein of ore: to be depleted of ore; now (generally), to diminish to nothing; to dwindle, to trail off.
Synonym of blue peter
A geek or nerd, especially a computer user with a deficient social life.
Someone weak and unimportant, a wimp.
A small creature which has a low cost to put into play, often used in a swarm with other such creatures.