to come upon unexpectedly or by chanceat a garage sale you just might pitch upon a table exactly the size you need
at a garage sale you just might pitch upon a table exactly the size you need
chance (upon), encounter, find, happen (on or upon), hit (upon), light (on or upon), meet, stumble (on or onto), tumble (upon)
luck (out, on, onto, or into)confront, facediscover, strike, turn up
bump into, come across, run across, run against, run into, run upon
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