sill

Spelling & Dictionary Insight

The English entry for sill is 4 letters long, classified as anoun, and transcribed in the International Phonetic Alphabet as /sɪl/. Corpus data places it at rank #29,086 in overall English word frequency, marking it as uncommon enough that many writers pause before typing it.Wiktionary records 6 distinct senses for this headword, so context determines which meaning a reader should apply.

Our Hunspell-derived misspelling index lists 3 documented wrong-spelling variants for sill, with forms such as "isll", "slil", and "ssill". Each variant represents a distinct typo pattern that appears often enough in corpora to be worth flagging, typically a doubled-consonant error, a silent-letter drop, or a vowel substitution.It also participates in 20 confusable-pair relationships, "SL", "six", "sir", and more, where similar look or sound leads writers to substitute one word for another in context.

Etymologically, the entry records: From Middle English sille, selle, sülle, from Old English syll, syl (“sill, threshold, foundation, base, basis”), from Proto-Germanic *sulī (“bar, sill”), from Proto-Indo-European *sel-, *swel- (“beam, board, frame, threshold”). Cognate with Scots sil, sill… Root origin matters for spelling because borrowed morphemes (Greek, Latin, Old French, Old English) carry their source-language orthographic conventions into modern English, which is why historical etymology is often the cleanest predictor of whether a cluster like "-ough", "-eau", or "-tion" will appear. For readers arriving here from a spelling check, the authoritative guidance is: the correct English form is sill, spelled S-I-L-L, and any other sequence of those letters, regardless of how natural it feels, is a misspelling in standard orthography.