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general::
1. Also, come upon;run across. Meet or find by chance, as in I came across your old letters today, or He came upon her looking in the store window. or If I run across it, I'll call you. The first term dates from the 1800s. The first variant was used by Oliver Goldsmith in She Stoops to Conquer (1773): "You are to go sideways till you come upon Crack-Skull Common." The second variant was used by Mark Twain in Tramp Abroad (1880): "If I don't run across you in Italy, you hunt me up in London." 2. Also, come across with. Pay or give what is expected or demanded, as in He finally came across with some food, or The landlord wants the rent, so come across. [Colloquial; late 1800s] 3. Make a particular impression, as in He comes across as a very sincere person, or Her meaning doesn't really come across; she'll have to revise the speech. [Colloquial; first half of 1900s] Also see GET ACROSS; PUT ACROSS.
American Heritage Idioms
2
general::
Phrase(s): come across
1. to be compliant. • Oh, she’ll come across, just you wait; she’ll do what we want. 2. to agree; to yield. • How can we get him to come across?, Phrase(s): come across (with something)
to deliver what is expected of one. • You had better come across with what you owe me. • You owe me money, and I wish you would come across., Phrase(s): come across someone or something [and] run across someone or something
to find someone or something; to discover someone or something. • John came across a book he had been looking for. • Where did you run across that lovely skirt?
McGrawhill's American Idioms And Phrasal Verbs