Át’ahálo is a Navajo expression that means “wait!” It’s a way of saying, “hold on” or “sit tight” without needing the entire set of conjugated verbs for “to wait.”
In speech, it is sometimes shortened to either át’ah or t’ahálo.
The word áłtsé also has a second meaning of “wait” but is primarily used to denote the first in a series of either nouns or actions. So both words can be used in the same sentence (e.g. “Wait, we will eat first.”).