To execrate is to detest, or to express great hatred.(verb)
If you deeply dislike your boss and you curse and swear at him, this is an example of a time when you execrate.
See execrate in Webster's New World College Dictionary
Origin: < L execratus, pp. of execrare, to curse < ex-, out + sacrare, to consecrate < sacer, sacred
See execrate in American Heritage Dictionary 4
transitive verb ex·e·crat·ed, ex·e·crat·ing, ex·e·crates
Origin: Latin execrārī, execrāt-
Origin: : ex-, ex-
Origin: + sacrāre, to consecrate (from sacer, sacred; see sak- in Indo-European roots).
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