plain as a pikestaff
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Related to plain as a pikestaff: plain as day
(as) plain as a pikestaff
Very obvious or noticeable; very easy to understand. It's plain as a pikestaff that they like each other— they've been flirting all night! In the end, the solution was as plain as a pikestaff.
plain as a pikestaff1 very obvious. 2 ordinary or unattractive in appearance.
This phrase is an alteration of plain as a packstaff , which dates from the mid 16th century, the staff being that of a pedlar, on which he rested his pack of goods for sale. The version with pikestaff had developed by the end of the 16th century