posílit znamená v angličtina

consolidate [consolidated, consolidating, consolidates]▼(to make stronger or more solid)
verb
[UK: kən.ˈsɒ.lɪ.deɪt] [US: kən.ˈsɑː.lə.ˌdet]

strengthen [strengthened, strengthening, strengthens]▼(to make strong or stronger)
verb
[UK: ˈstreŋ.θn̩] [US: ˈstreŋ.θn̩]

enforce [enforced, enforcing, enforces]▼((obsolete in English) to strengthen)
verb
[UK: ɪn.ˈfɔːs] [US: en.ˈfɔːrs]

bolster [bolstered, bolstering, bolsters]▼(to brace, reinforce, secure, or support)
verb
[UK: ˈbəʊl.stə(r)] [US: ˈboʊl.stə(r)]

brace [braced, bracing, braces]▼(to prepare for something bad)
verb
[UK: breɪs] [US: ˈbreɪs]