rearguard

Imagine an army on the move. The main force goes ahead, but some troops stay at the back to guard against attack and protect the others if they need to pull back. That is the rearguard. Outside military use, the word often appears in phrases like "rearguard action," meaning an effort to resist change, slow a loss, or delay defeat while others move on.

The word "rearguard" comes from military strategy. It refers to the troops stationed at the rear of an army during a march or battle. Their job is to protect the main force from attack from behind and to cover a retreat if the army has to fall back. They are the soldiers who bring up the rear and help keep the rest of the force safe.

The word is also used in a figurative way. Most often, you will see it in the phrase "rearguard action." In this sense, it means a defensive effort to delay change, resist defeat, or slow down something that seems likely to happen anyway. The idea is not usually of winning in the end, but of holding on, buying time, or making a retreat less damaging.

For example, a company trying to stop a move to digital systems might be said to be fighting a rearguard action. A politician trying to block a change that has broad support might also be described that way. In these cases, the word suggests determined resistance from a weaker or retreating position.

So the idea behind "rearguard" is consistent across both uses: it is about protection from the back, especially when retreat, delay, or resistance is involved. Whether it is literal soldiers or a figurative effort to slow change, the word carries a sense of pressure, caution, and stubborn defense.