n.

1. 1. A backward flow of water, as from the action of oars.
   2. See backrush.
2. A backward flow of air, as from the propeller of an aircraft.
3. A result of an event; an aftermath.

n. 1. the motion of receding waves.

2. a backward current of water or air created by the motion of an object through it.

See the Introduction, Abbreviations and Pronunciation for further details.

The return flow of water downslope to the sea after the swash of a wave has moved upshore. This flow is an important factor in determining the gradient of the beach; because coarse beach matter reduces the volume of the backwash through percolation, a steeper slope is needed to produce the more rapid flow required if the balance between swash and backwash is to be maintained. Steep waves and long waves are linked with stronger backwash, and hence flatter beach gradients.

When the path taken by the retreating backwash differs from the path taken by the incoming swash, the movement of sediment known as longshore drift will occur.

(DOD) An even layer of water that moves along the sea floor from the beach through the surf zone and caused by the pile-up of water on the beach from incoming breakers.

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Dansk (Danish)
n. - bovbølge, kølvand, eftervirkning
v. tr. - give efterdønning, give eftervirkning

Nederlands (Dutch)
luchtzuiging, kielwater, zog, terugslag

Français (French)
n. - (Naut, fig) remous
v. tr. - provoquer des remous

Deutsch (German)
n. - Rückwirkung, Sog, Kielwasser
v. - in den Sog geraten, durchspülen (Filter)

Ελληνική (Greek)
n. - επιστροφή κύματος, (δυσάρεστες) επιπτώσεις, απόνερα, δίνη αέρος από την περιστροφή έλικας

Italiano (Italian)
ripercussione, scia

Português (Portuguese)
n. - roda (f) d'água corrente, esteira (f) (Náut.), repercussão (f) (fig.)

Русский (Russian)
произведенный эффект, кильватер

Español (Spanish)
n. - remolinos de agua, resaca, repercusión, consecuencias, estela, contracorriente
v. tr. - repercutir

Svenska (Swedish)
n. - svallvåg, återverkningar, efterdyningar

中文（简体） (Chinese (Simplified))
浪涛, 反响, 逆流, 以尾流冲击, 以尾流反贱, 冲洗

中文（繁體） (Chinese (Traditional))
n. - 浪濤, 反響, 逆流
v. tr. - 以尾流沖擊, 以尾流反賤, 沖洗

한국어 (Korean)
n. - 역류, 여파
v. tr. - ~에 영향을 끼치다

日本語 (Japanese)
n. - 逆流, 後流, 余波

العربيه (Arabic)
‏(الاسم) خضربه الماء خلف السفينه السائرة, ارتدادات, عاقبه, تيار الهوا الناتج عن حركه الطائرة‏

עברית (Hebrew)
n. - ‮גלי מים או אוויר שנוצרו ע"י תנועת אוניה או מטוס, תוצאת-לוואי, תהודה, זרימה לאחור (של מים)‬
v. tr. - ‮ניקה (מסנן סתום) על ידי זרם אחורי‬

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