I read in an online article:
The Eagles didn’t draft an offensive lineman last year. In fact, they’ve only drafted three – Seumalo and Vaitai in 2016 and Johnson in 2013 – in the last five drafts. The Eagles had arguably the best line in the league last season, but the projected starting lineup will be an average age of 30.4 by the opener.
Peters tips the number, but center Jason Kelce (30), guards Stefen Wisniewski (29) and Brandon Brooks (29), and even Johnson (28) aren’t spring chickens anymore.
It appears that tip means to reach as the highest point here. Am I right? Strangely I just checked Google dictionary (a simpler version of the ODO) and Merriam Webster, and there's no definition of tip related to this usage.