at full strength—
1. working or performing at maximum capacity:
- Four refineries that were shut down are now operating at full strength.
2. (of a group of people) with all its members present:
- Although none of our teams were at full strength they all put in spirited performances.
in full strength—(also: in full force) = at full strength 2:
- The ladies were in full strength … each of them bringing a dish prepared by themselves.
Note: Neither expression correlates in meaning with the phrase with all one’s strength—using as much physical effort as one can:
- He looped the rope over the branch and pulled with all his strength.