'To eat heartily' definitions:

Definition of 'To eat heartily'

From: GCIDE

Heartily \Heart"i*ly\ (h[aum]rt"[i^]*l[y^]), adv. [From Hearty.]
1. From the heart; with all the heart; with sincerity. [1913 Webster]
I heartily forgive them. --Shak. [1913 Webster]
2. With zeal; actively; vigorously; willingly; cordially; as, he heartily assisted the prince. [1913 Webster]
To eat heartily, to eat freely and with relish. --Addison.
Syn: Sincerely; cordially; zealously; vigorously; actively; warmly; eagerly; ardently; earnestly. [1913 Webster]