German-English translations for nachgrübeln

brood
us
brood ducksa brood mareIn some species of birds, both the mother and father brood the eggs
ponder
us
I have spent days pondering the meaning of lifeI lit my pipe and had a ponder about it, but reached no definite conclusion

think
us
Idly, the detective thought what his next move should beI thought for three hours about the problem and still couldn’t find the solutionI tend to think of her as rather ugly