Abstinence means not eating meat at any meal during a day.
Please site a reference from the last 200 years stating that all the days of Lent are days of abstinence in any English speaking country.
English-speaking countries are almost all (or formerly controlled by) Protestant-majority countries. What has happened in the last 200 years, give or take, is that there has been a series of dispensations and indults conceding to local practice so that Catholic dietary rules would not seem so onerous in that social context. The
Catholic Encyclopedia item linked above, even back in 1909, leaves a LOT of room for subjective interpretation according to self-assessment of personal circuмstances. Beyond the roughly 1962 baseline, traditionalist Catholics seem to be sort of DIY in terms of how far back to go in picking what degree of fast-and-abstinence to observe, not only for Lent but also Advent, Ember Days, and other more obscure fasts during the liturgical year.
That's why I posed these questions, if there are folks here keeping to a more austere regimen (for whatever personal reasons, e.g., a special intention, reparation, aid in discernment, spiritual purgation, and so on). What is working for me so far is to take it a day at a time with more focus on prayer and reflection.