At the end of one's tether and At a loss

At a loss and at the end of one's tether are semantically related. In some cases you can replace phrase "At a loss" with "At the end of one's tether", this phrases are similar.

At a loss adverb - Below cost.

At the end of one's tether and at a loss are semantically related. Sometimes you can replace phrase "At the end of one's tether" with "At a loss", this phrases are similar.