Lengthen

Lengthen in betting refers to when odds increase, meaning the selection is becoming less favored by the market. This happens when there is less betting support or new information suggests a lower chance of winning.

For example, if a horse starts at 5.00 odds but drifts to 7.00, its odds have lengthened, indicating reduced confidence in its chances. Bettors may see this as a sign of less likelihood of winning or an opportunity for higher value.