English as a second language; ESL; TESOL ; Idioms (language teaching) ; Wortschatz (Sprachunterricht) ; Lernwortschatz; Vocabulary teaching ; ICLE ; Lexikometrie; Lexicometry; Automated Similarity Judgment Program; ASJP; Lexicostatistics ; Zweitspracherwerb (Textproduktion) ; Second language acquisition (text production) ; Text production (second language acquisition) ; Overgeneralization (second language acquisition) ; Zweitspracherwerb (lex.) ; Second language acquisition (lex.) ; Vocabulary (second language acquisition) ; Colligation; Collocation ; English