hit or kick out at someone or something. "the woman had lashed out in fear" Similar: hit out strike let fly take a swing set upon turn on round on attack weigh into lay into tear into pitch into lace into sail into set about 2. BRITISH spend money extravagantly. "I decided to lash out and treat myself" Similar: spend lavishly be extravagant pay out spend a lot of money splash out push the boat out splurge shell out squander money waste money fritter money away go on a spending spree go on a shopping binge Definitions from Oxford Languages