• a porous device for removing impurities or solid particles from a liquid or gas passed through it

Synonyms: strainer, sifter

• an arrangement whereby vehicles may turn left (or right) while other traffic waiting to go straight ahead or turn right (or left) is stopped by a red light

• pass (a liquid, gas, light, or sound) through a device to remove unwanted material

Synonyms: sieve, strain, sift, filtrate, riddle

• move slowly in a specified direction

Synonyms: seep, percolate, leak, trickle, ooze, dribble, bleed, flow