Soportar vs aguantar
 

Hi,

These two verbs are pretty similar in meaning. Is there a clear and concise way to separate connotations? Some expressions, for instance, where these verbs are not interchangeable.

Both "soportar" and "aguantar" are synonymous when they mean to bear the weight of something (literally or metaphorically), or to tolerate.

- Esta estructura no soporta/aguanta mucho peso.
This structure can't bear too much weight.

- No soporto/aguanto a Juan.
I can't stand Juan.

- Te entiendo. Siempre tienes que aguantar/soportar los abusos.
I empathize. You always have to bear the abuse.

- No me digas que no; mi corazón no lo soportaría/aguantaría.
Don't reject me; my heart wouldn't be able to take it.


They are not synonymous though, when the verb "aguantar" means to restrain or to contain:

- Aguanté las ganas de llorar para que no me vieran débil.
I held back the tears so they wouldn't see I was weak.

- Si el jinete no hubiera aguantado el caballo con las dos manos, me habría pisoteado.
If the rider wouldn't have had held the horse with both hands, it would have trampled me.

- ¿Cuánto aguantas la respiración bajo el agua?
How long can you hold your breath under the water?

Thanks!