What does "lagging" mean?

The covering of something with strips of felt, wood etc, either as insulation or for protection.

What is a synonym for "lagging"?

Common synonyms include: afterthought, backward, bind, block, blockade, blockage.

adj, noun, verb, slang

adj, noun, verb, slang ·2 syllables ·Common ·High school level

Noun

1
The covering of something with strips of felt, wood etc, either as insulation or for protection. uncountable, usually
2
insulation used to wrap around pipes or boilers or laid in attics to prevent loss of heat wordnet
3
The material so used. uncountable, usually
4
A prison sentence, originally one of at least three years. countable, slang, usually
""Whether you'll get a nine or a lagging depends on the answer you give me, Mrs. Inglethorne.""

Verb

Adjective

1
falling behind, not keeping up the pace
2
Occurring after; indicating the later phase of
"A leading wave is one which reaches its maximum value before another, which is thus a lagging wave"