Princeton's WordNet

1. number, keep down(verb)

   place a limit on the number of

2. repress, quash, keep down, subdue, subjugate, reduce(verb)

   put down by force or intimidation

   "The government quashes any attempt of an uprising"; "China keeps down her dissidents very efficiently"; "The rich landowners subjugated the peasants working the land"

3. keep down(verb)

   manage not to throw up

Kernerman English Learner's Dictionary

1. keep down(verb)kip

   to not vomit

   Finally, she was able to keep down a little food.

Wiktionary

1. keep down(Verb)

   To repress.

2. keep down(Verb)

   To restrain or control (a sound).

3. keep down(Verb)

   To cause not to increase or rise.

4. keep down(Verb)

   Not to vomit.

5. keep down(Verb)

   To lie low. To stay concealed by not standing up

• bedwing, onderdrukAfrikaans
• لا يَرْفَعُ رأسَهArabic
• стоя наведенBulgarian
• abaixar(-se)Portuguese (BR)
• zůstat při zemiCzech
• sich geduckt haltenGerman
• holde nedeDanish
• δε σηκώνομαι, μένω σκυμμένος, δεν αφήνω κπ. να σηκωθείGreek
• seguir agachadoSpanish
• madalal(e) hoidmaEstonian
• بلند نشدنFarsi
• pysyä alhaallaFinnish
• ne pas bougerFrench
• לְהִתכּוֹפֵףHebrew
• झुक कर रहनाHindi
• ne dopustiti da se podigneCroatian
• feküdj!Hungarian
• tetap merundukIndonesian
• halda kyrru fyrirIcelandic
• stare giùItalian
• 伏せるJapanese
• 억제하다Korean
• nesikelti, neleisti keltisLithuanian
• pieliekt; pieliektiesLatvian
• meniarapMalay
• (zich) laag houdenDutch
• bli liggende/sittendeNorwegian
• nie podnosić (się)Polish
• ،دست نگه داشتن بلند نشدنPersian
• لاس اخيستل،ټيټولPashto
• baixar-sePortuguese
• a continua să stea culcat, a nu se mişcaRomanian
• не высовыватьсяRussian
• zostať pri zemiSlovak
• ostati pri tlehSlovenian
• ostati doleSerbian
• hålla [sig] nereSwedish
• รักษาระดับต่ำไว้Thai
• eğilmekTurkish
• 趴下Chinese (Trad.)
• притиснутися до землі; не вставатиUkrainian
• اٹھے بغیر رہناUrdu
• ngồi, nằm xuốngVietnamese
• 卧下Chinese (Simp.)