The best replacement for expand is extend.

The best alternatives to expand are rated as following:
★★★★★  extend
★★★★★  expound
★★★  collapse
★★★  contract
★  detonate singularity
★  expend
★  detonate
★  riverbed
  create outlines
  contract metal
  expand
  collapse javascript
  collapse div

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Speaking about expand, one probably shouldn't forget about ease.

Other search terms related to expand and their ratings are:
★★★★★ ease
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Google Trends

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expand
extend
expound