clag

noun

1. A glue or paste made from starch.

2. Low cloud, fog or smog.

3. (Railway slang) Unburned carbon (smoke) from a steam or diesel locomotive, or multiple unit.

4. (Motor Racing slang) Bits of rubber which are shed from tires during a race and collect off the racing line, especially on the outside of corners.

verb

1. (obsolete) To encumber

2. To stick, like boots in mud