revenue, = the money a company earns from selling its products or services., be in a bit of a pickle, = be in a difficult or tricky situation, meticulously crafted, = made very carefully with great attention to detail., rigorous A/B testing, = a careful and detailed method of testing two versions of something to see which one works better., constant tweaks to its app, = small, regular changes made to improve the app., 3% rise in retention, = a 3% increase in the number of users who continue using the product., knows exactly what makes the users tick, = understands very well what users like and what motivates them., to stifle growth, = to stop or slow down development or progress., a valuation, = an estimate of how much a company is worth., sustainable strategy, = a plan that can continue successfully for a long time without causing problems..

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