jactarse bedeutet auf Englisch

brag [bragged, bragging, brags]▼(to boast)
verb
[UK: bræɡ] [US: ˈbræɡ]

boast [boasted, boasting, boasts]▼(to brag; to talk loudly in praise of oneself)
verb
[UK: bəʊst] [US: boʊst]