Gregory, on my word, we'll not carry coals.

I mean, an we be choler, we'll draw.

No, for then we should be colliers

Ay, while you live, draw your neck out of a collar

Samson refers to "coal" as trash. Then, Gregory uses "coal" to refer to a "collier" or a coal miner. Then, Samson uses "choler" as angry and Gregory advises Samson to let go of the "collar" as in temper.

Give me a torch. I am not for ambling. Being but heavy, I will bear the light.

Nay, gentle Romeo, we must have you dance.

Romeo refuses to dance and requests a torch("light") as he feels "light" or emotionally empty.