The difference between Come about and Transpire

When used as verbs, come about means to come to pass, whereas transpire means to give off (vapour, waste matter etc.).

check bellow for the other definitions of Come about and Transpire

Come about as a verb (intransitive):

To come to pass; to develop; to occur; to take place; to happen.

Examples:

"We have to ask, how did this come about?"
Come about as a verb (intransitive, nautical):

To tack; to change tack; to maneuver the bow of a sailing vessel across the wind so that the wind changes from one side of the vessel to the other; to position a boat with respect to the wind after tacking. See also .
Come about as a verb (intransitive):

To change; to come round.

Transpire as a verb (intransitive):

To give off (vapour, waste matter etc.); to exhale (an odour etc.).
Transpire as a verb (obsolete, intransitive):

To perspire.
Transpire as a verb (botany, intransitive):

Of plants, to give off water and waste products through the stomata.
Transpire as a verb (intransitive):

To become known; to escape from secrecy.

Examples:

"The proceedings of the council soon transpired."
Transpire as a verb (loosely, intransitive):

To happen, take place.