To be consistent as part of a group, or by common purpose.
To stick together physically, by adhesion.
To reinforce, to add to, to support (someone or something)
To make strong or stronger; to add strength to; to increase the strength of; to fortify.
To empower; to give moral strength to; to encourage; to enhearten.
To grow strong or stronger.
To substantiate; to corroborate (a belief, argument, etc.)
To augment; to improve; to intensify.