| aback | (adverb) by surprise | - |
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| (adverb) having the wind against the forward side of the sails | - |
| ahorseback | (adverb) on the back of a horse | Synonyms: ahorse, horseback |
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| back | (adverb) at or to or toward the back or rear | Synonyms: backward, backwards, rearward, rearwards |
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| (adverb) in or to or toward a past time | Synonyms: backward |
| (adverb) in repayment or retaliation | - |
| (adverb) in or to or toward a former location | - |
| (adverb) in or to or toward an original condition | - |
| (adverb) in reply | - |
| backstage | (adverb) in or to a backstage area of a theater | - |
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| (adverb) out of view of the public; behind the scenes | - |
| backward | (adverb) in a manner or order or direction the reverse of normal | Synonyms: backwards |
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| (adverb) in or to or toward a past time | Synonyms: back |
| (adverb) at or to or toward the back or rear | Synonyms: back, backwards, rearward, rearwards |
| backwards | (adverb) in a manner or order or direction the reverse of normal | Synonyms: backward |
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| (adverb) at or to or toward the back or rear | Synonyms: back, backward, rearward, rearwards |
| bacterially | (adverb) by bacteria | - |
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| bareback | (adverb) without a saddle | Synonyms: barebacked |
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| barebacked | (adverb) without a saddle | Synonyms: bareback |
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| horseback | (adverb) on the back of a horse | Synonyms: ahorse, ahorseback |
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| pickaback | (adverb) on the back or shoulder or astraddle on the hip | Synonyms: pig-a-back, piggyback |
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| (adverb) on a railroad flatcar | Synonyms: pig-a-back, piggyback |
| piggyback | (adverb) on the back or shoulder or astraddle on the hip | Synonyms: pickaback, pig-a-back |
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| (adverb) on a railroad flatcar | Synonyms: pickaback, pig-a-back |