From Longman Dictionary of Contemporary Englishpool of water/blood/light etcpool of water/blood/light etcLIQUIDAMOUNTa small area of liquid or light on a surface A guard found him lying in a pool of blood. a pool of light formed by the street lamp above → pool
Examples from the Corpus
pool of water/blood/light etc• His black telephone sat captive in a pool of light, ready for interrogation.• A guard found him lying in a pool of blood, and a doctor saved him.• Then on the fifth day, mid-morning, a pool of light as pale and clear as moonstone appeared on the horizon.• There was a pool of blood on the tarmac now, around his head.• A pool of light, expanding circles, merging, dragging me down.• She leaves the coach and wanders through fields for many miles until between trees she sees a deep black pool of water.• After they are replaced, the spent fuel rods are cooled for several years in pools of water at the plants.• The kind of pool of light depends on whether the bulb fitted inside is a spot, flood or an ordinary bulb. 