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ugly duckling
sb who is less attractive, successful etc than other people, but who becomes beautiful and successful later
underdeveloped country
a country, area etc that is poor and where there is not much modern industry
go underground
to start doing something secretly, or hide in a secret place
make yourself understood
make what you say clear to other people, especially when speaking a foreign language
give somebody to understand
(formal) to make sb believe that sth is true, going to happen etc, without telling them this directly