The difference between Old sweat and Soldier

Old sweat as a noun (British, military slang, mostly, WWI):

An experienced soldier.

Old sweat as a noun (British, military slang):

A veteran soldier or war veteran.

Old sweat as a noun (British, slang, figuratively):

Someone experienced in his or her field.

Soldier as a noun:

A member of an army, of any rank.

Soldier as a noun:

A private in military service, as distinguished from an officer.

Soldier as a noun:

A guardsman.

Soldier as a noun:

A member of the Salvation Army.

Soldier as a noun (British, New Zealand):

A piece of buttered bread (or toast), cut into a long thin strip for dipping into a soft-boiled egg.

Soldier as a noun:

Soldier as a noun:

Someone who fights or toils well.

Soldier as a noun:

The red or cuckoo gurnard ().

Soldier as a noun:

One of the asexual polymorphic forms of termites, in which the head and jaws are very large and strong. The soldiers serve to defend the nest.

Soldier as a verb:

To continue steadfast; to keep striving.

Soldier as a verb:

To serve a soldier.

Soldier as a verb:

To intentionally restrict labor productivity; to work at the slowest rate that goes unpunished.