lächelst

Lächelst is the second-person singular present tense form of the German verb lächeln, meaning to smile. It is used when addressing someone informally with the pronoun du.

Conjugation in the present tense follows the regular pattern for weak verbs: ich lächle, du lächelst, er/sie/es lächelt, wir lächeln, ihr lächelt, sie/Sie lächeln. The form lächelst specifically signals the second person singular you. The verb is built from the stem lächel- with standard endings.

Phonology and orthography: the stem includes the umlaut ä, and the sequence ch after a front vowel is pronounced as the ich-Laut [ç], as in ich. The present-tense endings attach to the stem, giving the familiar du-form lächelst and the other forms with -e, -t, or -en as appropriate. In writing, only the vowel in the stem carries the umlaut; other letters remain unchanged.

Usage and nuance: lächeln denotes the act of smiling, which can be a real facial expression or a polite gesture. Lächelst can appear in casual speech, letters, or dialogues to describe what the subject is doing now when speaking to one person informally. It also appears in compound tenses with auxiliary haben, e.g., er hat gelächelt.

Etymology: lächeln is derived from the noun Lächeln (smile); the verb form shares the same root and is used across standard German.