What does lam mean?
Lam is an unusual English noun because it is usually encountered not as an ordinary label for a person or thing but inside the fixed phrase "on the lam." In that idiom, it means fleeing or hiding, especially to avoid arrest or capture. The expression has an informal, crime-associated tone and is common in news reporting, police contexts, and conversation, while the fuller phrase "on the run" may sound more neutral in British usage. Lam can also appear in figurative language when something is moving rapidly away from scrutiny or difficulty, though its established meaning remains escape. Although the word looks and sounds like "lamb," the two are unrelated in the modern phrase, and recognizing the idiomatic whole is essential for understanding it. The expression developed a strong association with fugitives and became especially familiar in 19th-century American English. Knowing "on the lam" adds a vivid and idiomatic alternative to saying that someone is fleeing the authorities.
nounA state or condition of fleeing or hiding, especially to avoid arrest or capture. The word is used chiefly in the phrase "on the lam."
- The condition of fleeing or hiding, especially to avoid arrest or capture, chiefly in the phrase "on the lam."
"After the robbery, the suspect went on the lam across three states."
"After the robbery, the suspect went on the lam across three states."
"For years, the missing witness remained on the lam and communicated only through intermediaries."
The plural is uncommon in ordinary prose and is encountered mainly in legal, police, or law-enforcement contexts.
"Detectives issued bulletins for the two lams."
Lam and lamb are perfect sound twins, but only one belongs in the expression "on the lam."
Reviewed by Deb Chak, Editor. AI-assisted content curated by RJS Tech Solutions LLP.
Where does lam come from?
The expression "on the lam" is well attested in 19th-century English and became especially associated with American usage. Its ultimate origin is uncertain, and some proposed connections with older forms remain disputed. Early usage associated lam with flight or escape, but in modern English its principal survival is within the idiom.
How lam is actually used
The bare word is unusual outside the fixed expression. It is informal to mildly colloquial, although it is standard in journalism, legal contexts, and crime reporting; British speakers also commonly use the alternative phrase "on the run."
Easily confused with lam
Lamb is the young of a sheep and is pronounced /læm/, but lam usually occurs in the idiom "on the lam," meaning to be fleeing or hiding.