dalles

/dælz/

noun

(plural only) The rapids in a deep, narrow stream confined between the rock walls of a canyon or gorge.

The dalles of the river were treacherous to navigate.

意味（1）

(plural only) The rapids in a deep, narrow stream confined between the rock walls of a canyon or gorge.

意味（2）

(plural only) A steep-sided part of a stream channel, near the dalles proper, marked by clefts, ravines, or gorges.