Luft

Luft, the German word for "air" (sometimes also "space" or "breath"), is used by some chess writers and commentators to denote a space left by a pawn move into which a castled king may move, especially such a space made with the intention of avoiding a back-rank mate. A move leaving such a space is often said to "give the king some luft".
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n. air, mixture of gases that make up the Earth's atmosphere; wind; ambience; appearance; tune

aero, of air or oxygen

v. air, ventilate, aerate; disclose, reveal

air

f air

m gap
clearance; backlash; slackness; spacing

n clearance
play; backlash